GE SecoVac Series - Interlocks; Installation

Operation
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SecoVac 3.3kV-27kV Embedded Pole Vacuum Circuit Breaker
The follow interlocking facilities are
incorporated to ensure the safe operation
of the breaker. when the breaker is closed,
the withdrawable circuit breaker cannot
be racked between the service position
and test position.
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When the earthing switch is in the
closed position, the withdrawable
circuit breaker cannot be racked into
the service position
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When the withdrawable circuit breaker
is in service position, the earthing
switch cannot be closed
Correct installation is of primary
importance, the manufacturer’s
instructions must be carefully studied
and followed. It is good practice to use
gloves for handling the breaker during the
installation.
Please carry out installation and wiring
of breaker according to manual. Do not
place any foreign objects in the breaker or
modify it in anyway.
Check before installation
After the breaker is unpacked, check
the poles for any signs of mechanical
damage. The product nameplate and
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order. Check goods according with the
packing list.
Clean the insulating parts with a clean
dry cloth. Make sure the upper and lower
contact arms are clean and free of any
deformation caused by mishandling
during transport or storage.
Check the vacuum pressure in the vacuum
interrupter through power frequency
withstand voltage test. If it fails, please
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Interlocks
Installation
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breakers
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The careful and professional
installation is a fundamental condition
for the failure free operation of the
circuit breaker
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The circuit breaker should be
installed so that there are no external
forces applied to it from busbars or
mechanical supports
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The busbar connection should not
cause any deformation to the breaker
terminals
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Take note of supplied drawings for bolt
sizing and lengths
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Use the standard bolts with strength
of class 8.8 and the disc springs to
tighten the bus bar (Table 1)
Table 1 Tightening torque of bolt
Basic dimensions
of bolts (mm)
Tightening torque
without lubricant applied (N

m)
Tightening torgue
with lubricant applied (N

m)
M8
2 10
M10
4 2
M12
8 4
M16
170 80